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  • A17/2c - Volume 2c: Technical Report: Ground Investigation

    Transport and Works Act 1992

    Boston Barrier Order

  • We are the Environment Agency. We protect and improve the environment.

    Acting to reduce the impacts of a changing climate on people and wildlife is at the heart of everything we do.

    We reduce the risks to people, properties and businesses from flooding and coastal erosion.

    We protect and improve the quality of water, making sure there is enough for people, businesses, agriculture and the environment. Our work helps to ensure people can enjoy the water environment through angling and navigation.

    We look after land quality, promote sustainable land management and help protect and enhance wildlife habitats. And we work closely with businesses to help them comply with environmental regulations.

    We can’t do this alone. We work with government, local councils, businesses, civil society groups and communities to make our environment a better place for people and wildlife.

    Published by:

    Environment Agency Horizon House, Deanery Road, Bristol BS1 5AH Email: enquiries@environment-agency.gov.uk www.gov.uk/environment-agency

    © Environment Agency 2014

    All rights reserved. This document may be reproduced with prior permission of the Environment Agency.

    Further copies of this report are available from our publications catalogue: www.gov.uk/government/publications

    or our National Customer Contact Centre: T: 03708 506506

    Email: enquiries@environment-agency.gov.uk.

    http://www.gov.uk/environment-agency http://www.gov.uk/government/publications mailto:enquiries@environment-agency.gov.uk

  • A17/2c - Volume 2c: Technical Report: Ground Investigation Report iii

    Quality Assurance

    Approvals

    Name Title Date Version

    SS Technical Director Geotechnics

    12/08/2016 1

    MT Senior Civil Engineer 12/08/2016 1

    Project name Boston Barrier Tidal Project

    Project 1B1S reference IMAN001472

    Date 12 August 2016

    Version number 1

    Author LG

    EIA Quality Mark

    This Environmental Statement, and the Environmental Impact Assessment (EIA) carried out to identify the significant environmental effects of the proposed development, was undertaken in line with the EIA Quality Mark Commitments. The EIA Quality Mark is a voluntary scheme, operated by the Institute of Environmental Management and Assessment (IEMA), through which EIA activity is independently reviewed, on an annual basis, to ensure it delivers excellence in the following areas: EIA Management EIA Team Capabilities EIA Regulatory Compliance EIA Context & Influence EIA Content EIA Presentation Improving EIA practice To find out more about the EIA Quality Mark please visit:

    www.iema.net/qmark

    http://www.iema.net/qmark

  • A17/2c - Volume 2c: Technical Report: Ground Investigation Report iv

    This page has been left intentionally blank.

  • Boston Barrier

    Ground Investigation Report

    February 2015

    Environment Agency

  • 335092 WCD WAM 01 A

    pims/339200 Boston Barrier TWAO/Products/Design Products/GI/GIR

    07 February 2015

    Boston Barrier

    Ground Investigation Report

    Boston Barrier

    Ground Investigation Report

    February 2015

    Environment Agency

    Kingfisher House Goldhay Way Orton Goldhay Peterborough PE2 5ZR

    Mott MacDonald, Demeter House, Station Road, Cambridge CB1 2RS, United Kingdom

    T +44 (0)1223 463500 F +44 (0)1223 461007 W www.mottmac.com

  • 335092/WCD/WAM/01/A 07 February 2015 pims/339200 Boston Barrier TWAO/Products/Design Products/GI/GIR

    Boston Barrier Ground Investigation Report

    Revision Date Originator Checker Approver Description

    01 16 February 2015 L Griffith S Solera M Taylor First Draft for Comment

    02 24 February 2015 L Griffith S Solera M Taylor Updated issue

    Issue and revision record

    Information Class: Standard

    This document is issued for the party which commissioned it and for specific purposes connected with the above-captioned project only. It should not be relied upon by any other party or used for any other purpose.

    We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties.

    This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which commissioned it.

  • 335092/WCD/WAM/01/A 07 February 2015 pims/339200 Boston Barrier TWAO/Products/Design Products/GI/GIR

    Boston Barrier Ground Investigation Report

    Chapter Title Page

    Executive Summary i

    1 Introduction 1

    1.1 Background __________________________________________________________________________ 1 1.2 Objectives ___________________________________________________________________________ 1 1.3 Scope of Work _______________________________________________________________________ 2 1.4 Sources of Information _________________________________________________________________ 2 1.5 Parties Involved ______________________________________________________________________ 2 1.6 Limitation and Responsibilities for Information ______________________________________________ 3

    2 Environmental Setting 5

    2.1 Site Location and Design Details _________________________________________________________ 5 2.2 Topography __________________________________________________________________________ 7 2.3 Hydrology ___________________________________________________________________________ 8 2.4 Historical Maps _______________________________________________________________________ 8 2.5 Geological Information ________________________________________________________________ 10 2.6 Hydrogeology and Groundwater ________________________________________________________ 11 2.7 Potential Contamination _______________________________________________________________ 11

    3 Ground Investigation Field and Laboratory Results 13

    3.1 General ____________________________________________________________________________ 13 3.2 Ground Investigation Rationale _________________________________________________________ 13 3.3 Fieldwork __________________________________________________________________________ 13 3.4 Standards __________________________________________________________________________ 14 3.5 Service Inspection ___________________________________________________________________ 14 3.6 Investigation Techniques ______________________________________________________________ 15 3.7 In-situ Testing _______________________________________________________________________ 17 3.8 Sampling ___________________________________________________________________________ 17 3.9 Installations and Monitoring ____________________________________________________________ 18 3.10 Laboratory Testing ___________________________________________________________________ 18

    4 Summary of Fieldwork Ground Conditions 21

    4.1 Services ___________________________________________________________________________ 21 4.2 Structural Elements __________________________________________________________________ 22 4.3 Voids ______________________________________________________________________________ 23 4.4 Condition of the Lock _________________________________________________________________ 25 4.5 Summary of Strata Encountered ________________________________________________________ 26 4.6 Geological Cross Sections _____________________________________________________________ 28 4.7 Evidence of Contamination ____________________________________________________________ 29

    5 Ground Conditions and Geotechnical Properties 31

    Contents

  • 335092/WCD/WAM/01/A 07 February 2015 pims/339200 Boston Barrier TWAO/Products/Design Products/GI/GIR

    Boston Barrier Ground Investigation Report

    5.1 Data Set ___________________________________________________________________________ 31 5.2 Definition of Parameters _______________________________________________________________ 32 5.3 Classification and SPT Data ____________________________________________________________ 35 5.4 Total Stress Data ____________________________________________________________________ 46 5.5 Effective Stress Results _______________________________________________________________ 52 5.6 Stiffness ___________________________________________________________________________ 55 5.7 Concrete Aggressivity Results __________________________________________________________ 56 5.8 Permeability Results __________________________________________________________________ 57 5.9 Groundwater Monitoring Results ________________________________________________________ 58 5.10 Summary of Parameters ______________________________________________________________ 62

    6 Phase II Contaminated Land Assessment 63

    6.1 Methodology ________________________________________________________________________ 63 6.2 Risks associated with commercial/ industrial proposed end use. _______________________________ 63 6.3 Soil Laboratory Results ____________